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https://issues.apache.org/jira/browse/MAHOUT-1236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13672188#comment-13672188
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Jake Mannix commented on MAHOUT-1236:
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Why protobufs? Why not thrift or avro? Maybe we should make this pluggable?
> Need a cleaned up serialized format for Vectors to handle names and all other
> kinds of things
> ---------------------------------------------------------------------------------------------
>
> Key: MAHOUT-1236
> URL: https://issues.apache.org/jira/browse/MAHOUT-1236
> Project: Mahout
> Issue Type: Bug
> Reporter: Ted Dunning
>
> Our current serialization is subject several ills
> a) it breaks alignment by having a 1 byte flag field (evil, generic)
> b) it doesn't handle any kind of extensible format like protobufs so it isn't
> future-proof
> c) it doesn't handle named vectors very well
> d) it totally breaks with any other kind of decoration as with Centroids or
> WeightedVector or ... (see b)
> I propose that we use the current tag byte on the current serialization with
> a new flag bit that indicates that the vector will use a protobuf encoding.
> Then 3 bytes will be skipped to restore alignment. Then there will be a
> protobuf encoding for the vector.
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